Analysis of Pesticides in Food and Environmental Samples - Chapter 4 ppt

... Extraction 43 2.3.3 Liquid–Liquid Extraction 45 2.3 .4 Solid-Phase Extraction 45 2.3 .4. 1 Polar Sorbents 46 2.3 .4. 2 Nonpolar Sorbents 48 2.3 .4. 3 Ion-Exchange Sorbents 49 2.3 .4. 4 Affinity Sorbents 49 2.3.5 ... LLC.2Sample Handling of Pesticides in Food and Environmental Samples Esther Turiel and Antonio Martín-EstebanCONTENTS2.1 Introduction 362.2 Sample Pretreatment 362.2.1 Drying 372.2.2 Homogenization ... 3267, 1997. 14. Pichon, V., Chen, L., and Hennion, M C., On-line preconcentration and liquid chroma-tographic analysis of phenylurea pesticides in environmental water using a silica-basedimmunosorbent,...

... uncertainty of sampling and CVLis the combined uncertainty of thelaboratory phase including sample processing (Sp) and analysis (A). The preparation of portion of sample to be analyzed 14 as ... determine the size, frequency (time or distance), spaci ng, mixing, dividing of samples, and consequently the time required for sampling and the cost of sampling, shipping, and analysis of samples. ... precautions.Determination of the time required for reaching the sampling site and handling the samples .Provisions for prevention of contamination and deterioration of samples atall stages, including size...

... L., and Tadeo, J.L. Determination of corn herbicides byGC-MS and GC-NPD in environmental samples, J. Agric. Food Chem., 42 , 2210, 19 94. 21. Balinova, A.M. and Balinova, I. Determination of herbicide ... determination in soil of herbicides used in forestry by GC-NPD and GC-MS, J. Agric. Food Chem., 46 , 18 64, 1998.31. Sánchez-Brunete, C., et al. Multiresidue herbicide analysis in soil samples ... application of sensors and biosensors in thedetermination of pesticide s in envir onmental samples is also rapidly increasing.These portable analytical devices offer the possibility of in situ analysis...

... LLC.9 .4 Capillary Electrophoresis 244 9 .4. 1 Principles 244 9 .4. 2 Advantages 245 9 .4. 3 Disadvantages 245 9 .4. 4 Trends 245 9 .4. 5 Applications 245 9.5 Immunoassays 246 9.5.1 Principles 246 9.5.2 ... metalaxyl and vinclozolin in environmental waters. Analytica Chimica Acta 19 94, 293(1–2), 109–117. 34. Chiron, S., Barcelo, D., Determination of pesticides in drinking-water by online solid-phase ... Method 507 nitrogen- and phosphorus-containing pesticides in water.Jackson and Andrews [44 ] evaluated the use of SPME under nonequilibriumconditions for analysis of organochlorine pesticides. SPME...

... develop and maintain minor uses, and to implement a faster approval of reduced-risk pesticides and those used on minor crops.• The zero-tolerance standard for certain pesticides in processed foodsbe ... protecting man from dis-ease and increasing his ability to produce food and fiber. However, theuse and misuse of pesticides has become one of the major concerns of all who are interested in a ... discussions during the early 1970s conveyed a sense of urgency in dealing with serious environmental impacts of the use of pesticides but never lost sight of the importance of maintaining agricultural...